The Dubuque Archdiocese announced Jackels' appointment by Pope Francis on Monday. Jackels replaces Archbishop Jerome Hanus, who also announced his resignation Monday due to declining health.

"I am humbled by the trust Pope Francis has in me to do this ministry. It would appear that this is an expression of his affinity for the poorest, weakest, and the least important," Jackels said.

Hanus, who introduced Jackels at the conference, said he will serve as apostolic administrator until the installation. That means Hanus will make day-to-day decisions for the archdiocese until Jackels formally begins his job. Officials said more information about Jackels' installation will be available later.

Hanus plans to resume life as a monk at the Conception Abbey monastery in Conception, Mo.

"Both of our dioceses are undergoing massive changes in agriculture, population, diversity and economics. Our new archbishop is no stranger to these challenges which characterize the Midwest. He will bring new energy and insights as we move toward the future," Hanus said.